Why not encrypt salt?

Assuming I had to distribute salt+ciphertext together over an insecure channel, isn't it better to store the salt encrypted?

By encrypted I mean with a block cipher and with key and IV derived from the same passphrase used to encrypt the original text.

I've been told that leaving salt unencrypted is the way to go. Why? Why not encrypt? Isn't it always better?

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Encrypting the salt either uses another salt, or lets an attacker use pre-computation $\hspace{1.5 in}$ for the first part of each decryption attempt. $\:$ –  Ricky Demer Aug 30 '12 at 5:28